Lamp guard and mounting therefor



April 15, 1930. H. BRACHTL.

LAMP GUARD AND MOUNTING THEREFOR Filed Jan. 21, 1928 ment of a lampwhich is lamp socket Patented Apr. 15, 1930 are FFlCE NOIS BY MESN'EASSIGNMENTS, TO A CORPORATION OF ILLI- LAMP GUARD AND MOUNTING THEREFORApplication filed January The invention relates generally to protectivedevices for guarding incandescent lamps from breakage and the generalobject of the invention is to provide a novel device of this characterwhich is composed of separate units or sections which when in assembledrelation will serve effectively to protect an incandescent lamp andwhich may be easily and readily assembled about a lamp or dis-assembledto facilitate inspection, cleaning or replaceprotected thereby.

Stated more specifically the invention aims to provide such a protectivedevice composed of two major units, to wit, a guard which is adapted toslip over a lamp and a carrier or mounting therefor which includes alocking means instantly operable by the fingers without the use of toolsfor securing or releasing said guard.

Another object of the invention is to provide such a guard which hasgreat strength and rigidity so as to satisfactorily protect anincandescent lamp but which is so formed that the parts thereof willofier the minimum interference to the passage of light rays from thelamp protected thereby.

Other objects and advantages will become apparent from the followingdescription of the device and from the accompanying drawings in which:

Figure 1 shows an elevational view of a containing a lamp guarded by aprotective device embodying the present in.- vention.

Fig. 2 shows a fragmental cross sectional view taken in the planeindicated by the line 2 -2 in Fig. 3.

Fig. 8 is a bottom plan view of the mountmg.

Figs. 4 and 5 are fragmental perspective views of the members which makeup the guard.

While the invention is susceptible of various modifications andalternative construe tions, I have shown in the drawings and will hereindescribe in detail the preferred embodiment, but it is to be understoodthat I do not thereby intend to limit the invention to the specific formdisclosed but intend to cover all modifications and alternative con- 21,192s. Serial No. 248,286.

structions falling within the spirit and scope of the invention asexpressed in the appended claims.

The guard which is designated as 5 is best shown in its operativeposition in Fig. 1 about an incandescent lamp 6 and associated with thecarrier '7 so that the two parts completely surround and protect thelamp. The guard 5 is preferably formed with one open end, the bottom endas shown in Fig. 1, so that when it is dis-associated from the carrier 7it may be freely moved axially of the lamp 6 out of its surroundingrelation to permit inspection cleaning or replacement of the lamp.

In order that the guard may have great rigidity and yet form a minimumof obstruction to the passage of light rays from the lamp the guard ispreferably formed from thin flat members or strips which may be ofsubstantially rectangular cross section and which are so positioned inthe finished guard so that the greatest cross-sectional dimensionthereof lies substantially along the path of the light rays.

As illustrated herein the guard comprises a plurality of U-shapedmembers 10 which are arranged in crossing relation at their mid-pointsand are joined by a plurality of ring-shaped members 11 positioned atspaced intervals along the sides of the U. In forming and assembling theU-shaped members 10 and ring members 11 in accordance with the objectsabove set forth, the flat strip which makes up each of the U-members isarranged so as to lie substantially in a plane which passes through thelongitudinal axis of the guard while the strip which makes up each ringmember is arranged to lie substantially flat in a plane which isperpendicular to said axis. The Ll-shaped members and the ring membersare preferably associated with each other by joints which are of the laptype and which are made by forming notches 12 in the outer edges of theU-members (Fig. 4) and notches 13 in the inner edges of the ring members(Fig. 5). Thus when the two memhere are placed in crossing relation theouter edges of the two are flush. Similar notches are formed in theU-members at the point of crossing so as to form a similar joint and allof the joints are preferably xed to ether as by soldering.

Thus a guard is formed which is closed at one end by the crossing of theU-members and which is open at the other end to allow it to he slippedover an incandescent lamp so as to surround and protect the lamp.

The carrier 7 is adapted to be associated with the open end of the guardto close that end and complete the protective device and means isprovided for interengaging the two members so as to maintain them intheir associated reiation. In the embodiment illustrated this means ismounted principally upon the carrier 7, the parts on the carrier ingarranged to effect an interlocking relation with a plurality ofanchoring elements which project axially from the open end of the guardThese anchoring elements 15 are preferably formed by continuations ofthe sides of the U-members 10.

The carrier 7 preferably comprises an annular body member 16 havinganother annular member or ring 17 mounted about its outer peripheraledge for limited rotational and limited axial movement relative thereto.The means herein shown for securing the one member to the other and forlimiting and guiding their relative movement comprises 2. plurality offlanges 18 which project in an axial direction from the member 17 nearthe inner edge thereof so as to abut the outer peripheral surface of themember 16. An angularly extending slot 19 is formed in each of theflanges 18 and a plurality of studs 20 are fixed on the body member 16so that each stud will project outwardly therefrom into one oi the slots19. Thus the outer ring 17 is secured on the inner body member 16 andits rotative and axial movement relative thereto are limited by thedirection and extent of the slots 19.

A plurality of opposed notches 21 and 22 are formed in the members 16and 17 respectively, being positioned so as to be in registry when themembers are at one limit of their rotational movement and spaced so asto receive the anchoring elements 15 when in registry. Suitablypositioned notches 23 are formed in the outer edges of the anchoringelements 15 so that the ring 17 may be rotated relative to the bodymember 16 and the anchoring elements 15 to enter the notches .23 in theanchoring elements and form an interlocking engagement therewith. Toprovide for a more rigid relation between the guard 5 and the carrier 7abutments are formed on the guard 5, preferably by positioning one ofthe circular members 11 so that it abuts the end of the body member 16of the carrier. It will be apparent that the angular arrangement of theslots 19 will cause the member 17 to move axially during its rotationinto interlocking engagement with the guard, thus drawing the ring 11firmly into contact with the body member 16.

In the use of the device it is desirable to have the ring 17 freelyrotatable manually without the use of tools of any kind and to this endthe outer peripheral surface thereof is knurled as at In case it isdesirable to iix or secure the ring 17 so as to require the use of toolsbefore rotation, one of the studs 20 may be in the form of a screw 26threaded in the body member and arranged to clamp the iange 18.

lvieans may also be provided to facilitate the attachment of the carrier7 to a support such as an outlet box 30 or the like, and also forsecuring a lamp socket 31 to the carrier. In the present instance aninwardly extending flange 32 formed on the body member 16 of the carrierand suitably positioned apertures 33 and formed therein to receivesecuring means.

Thus a pair of screws 35 may extend through apertures into threadedengagement with a. securing ring 36 within the outlet box 3-) to securethe carrier and outlet box together. The socket 31 may then be securedto the arrier 7 by screws (not shown) engaging the threaded apertures 34in the flange 32.

From the foregoing description it will be apparent that the inventionprovides a protective device of a rugged character which does not undulyrestrict the passage of light from the lamp protected and that the guardand carrier may be readily disassociated for inspection or replacementof the lamp.

I claim as my invention 1. A protective device for incandescent lampshaving, in combination a guard carrier, a guard open at one end toreceive a lamp and adapted to abut said carrier, said carrier comprisinga body member, a ring rotatably mounted on said body member and arrangedto move axially of the member during such rotation, said member and saidring having opposed notches formed therein arfed to be carried into andout of registerrelation by relatively rotating said ring and member, aplurality of fingers on the open end of the guard adapted to he insertedinto said notches when in regist said fingers having notches therein topermit rotation of said ring to carry its notches out of registry withthe notches in said member to secure said guard to the carrier. andmeans operable during such rotation of the ring to move the ring axiallyof the body member and thereby draw the guard into firm clampingabutment with said body member.

2. A protective device for incandescent lamps havig. in combination, aguard open one end to receive a lamp, and a carrier for the guardcomprising a pair of annular members secured together for relativerotary movement, said two members having on posed notches formed thereinarranged to he carried into and out of registering relation trywith thenotches in the other by relatively rotating said members, and aplurality of fingers on the open end of the guard adapted to be insertedinto said notches when in registry, said fingers also having notchestherein to permit rotation of one of said members to carry its notchesout of regismember and thereby secure the guard in interlocking relationto said carrier,

3. A protective device for incandescent lamps having, in combination, aguard open at one end and having a plurality of anchoring fingers, and acarrier for the guard comprising a pair of parts mount-ed for relativemovement and providing openings to receive said fingers, said partsbeing adapted in their relative movement to efiect an interengagement ofthe guard and the carrier.

4. A protective device for incandescent lamps having, in combination, acarrier, and a guard open at one end to permit it to be slipped over alamp and into abutment with said carrier, and having a plurality ofanchoring elements, said carrier providing a plurality of openingstherein to receive said anchoring elements and having means movablerelatively to said guard and said carrier for efi'ecting an interlockingrelation between said anchoring elements and the carrier, said meansbeing operable to draw said guard axially into firm abutment with saidcarrier.

5. A protective device for incandescent lamps comprising, incombination, a guard carrier, a guard open at one end to permit it to beslipped over a lamp and into abutment with the carr1er,sa1d carriercomprising a body member, a ring rotatably mounted on said memberarranged when rotated to engage and lock said guard against axialmovement relative to said ring, and means operable during such rotationof said ring to move said ring axially of the body member and thereby todraw said guard into firm abutment with said member.

6. A protective device for incandescent lamps comprising, incombination, a guard carrier, and a guard having an open end andarranged to abut saidcarrier, said carrier comprising a body member anda ring mounted rotatably thereon arranged when rotated to engage saidguard and to move axially on said body member to draw said guard intofirm abutment therewith.

7. A protective device "for incandescent lamps having, in combination, aguard open at one end and having a plurality of anchoring elements,abutments on said anchoring elements, and a carrier for the guardcomprising a member adapted to receive said anchoring elements and tobear against said abutments, and a part movably mounted on said memberand adapted in its movement to effect an interengagement with saidanchoring elements, and to draw said abutments into firm contact withsaid member.

8. Aprotective device for lamps comprising, in combmatlon, a guard openat one end and having a plurality of anchorlng ele ments thereon, acarrier for said guard adapted to detachably receive said anchoringelements, without distortion of the guard or anchoring elements andmeans movable relatively to said carrier and said guard and operablewithout distortion of said guard to effect an interengagement of each ofsaid elements, said carrier to maintain the parts in assembled relation.

9. A lamp guard comprising a plurality of U-shaped members formed fromflat strips of metal, the strip forming each U-member lyingsubstantially in a plane passing through the longitudinal axis of theguard, each side or leg "of the U-members having a plurality of notchesformed at spaced intervals along the outer edge thereof, and a pluralityof reinforcing members formed from flat strips of metal lying in planessubstantially perpendicular to the sides or legs of said U-members andencircling said legs, each reinforcing member having a plurality ofnotches formed at spaced intervals about the inner edge thereof andadapted to cooperate with said first mentioned notches to form lapjoints connecting said U-members and said reinforcing members.

10. A protective deviceior lamps c0mprising, in combination, a guardopen at one end and having a plurality of anchoring elements thereon, acarrier for said guard adapted to detachably receive said anchoringelements, and means mounted on said carrier and movable relativelythereto to engage each of said anchoring elements to fix them inposition relatively to said carrier.

11. A protective device for lamps comprising, in combination, a guardopen at one end and having a plurality of anchoring elements thereon, acarrier for said guard adapted to removably receive said anchoringelements without distortion of the guard or the elements, and meansmovable relatively to said elements and said carrier and along theperiphery of said carrier to fix said elements in position relatively tosaid carrier.

12. A protective device for lamps comprising, in combination, a guardopen at one end and having a plurality of anchoring elements thereon, acarrier for said guard adapted to removably receive said anchoringelements, and means mounted on said carrier operable by rotativemovement relatively to said carrier about the axis of said guard tosecure said guard in position on said carrier.

13. A protective device for lamps comprising, in combination, a guardopen at one end and having a plurality of anchoring elements thereon, acarrier for said guard adapted to removably receive said anchoringelements by an axial movement of said guard to fix said guard againstrotation relatively thereto and means mounted on said carrier operableby a rotative movement relatively to said carrier and about the axis ofsaid guard to fix said elements against axial movement relatively tosaid carrier.

14. A protective device for incandescent lamps having, in combination, aguard member open at one end to permit it to be slipped over a lamp, acarrier member adapted to abut the open end of said guard member, aplurality of anchoring elements on one of said members, the other ofsaid members having means providing recesses to receive said elementswhen said members are placed in abutting relation, and locking meansmovably mounted on said other member and adapted in its movementrelative to said other membar to engage said elements and thereby effectan interenga ement of said members.

In testimony w ereof, I have hereunto afmy signature.

HENRY BRACHTL.

